Process of dyeing and product thereof.



2 solution and 80 40 sulfite solution 17 B.

, UNITED srArns PATENT OFFICE.

JOSEPH DEINET, OE ELBERFELD, GERMAlfiYpAsslGNqR TO FARBENFABRIKEN VORM. ERIEDR. BAYER & CO., 01? ELBERFELI), GERMANY, A CORPORATION OF GERMANY.

PROCESS OF DYEING AND PRODUCT THEREOF.

972,065. No Drawing.

' 5 useful Improvements inProcesses of Dyeingand Product Thereof, of which the following is a specification.

I have made the surprising discovery that the dibenzoyl-1.8-diaminoanthraquinone can be used as a valuable vat dye. It yields with alkaline reducing agents a vat which dyes the textile fiber a yellow shade of excellent fast'ness.

In order to illustrate my new process more fully'thefollowing example isgiven, the

parts being by weightzzstir up 'kilos of dibenzoyl-1.8-diaminoanthraqu1none (10 per cent. paste) with 50 liters of warm water,

add'to this 1nixture40 liters of a hydrosulfite 20 solution 20B. and 6 liters caustic sodalye B. After a short time the color is completely dissolved. Prepare a dye bath which should contain 2000 liters"wat er,-3 liter caustic soda lye 80. B6. and Qliters hydr'osulfite parts of common salt and add to this cold, bath the dye solution prepared as above indicated, through a sieve. Stir the bath well, let stand during some minutes, enter 100 kilos well wetted out cot- 30 ton ;and work for 1 hour in the cold bath.

shade is thus obtained.

Wool. is dyed in an analogous way: Stir up 10 kilos dibenzoyl-l.S-diaminoanthraquinone (10 per cent.) with 8-l0kilos caustic soda lye 30 B. and 30 liters of a hydro- When all the color is thoroughly dissolved, add this solution to the dye bath which consists of 12001500 liters of water of 30C., to'which 1}- liter caustic soda lye 30 B. and 2 liters of a hydrosulfite solution 17 B. and 204:0 kilos Glaubers salt has previously been added. Enter kilos wool, work for to 1 hour at 30 0;, the goods being continually immersed in the liquor.- After dyeing; squeeze Specification of Letters Patent.

Patented Oct. 4, 1910.

Application filed April 29, 1909. Serial no. 492,990.

out well, oxidize by exposure to, air, rinse, acidulate, wash and dry. A- very fast yellow shade is thus obtained.

Silk and charged silk is dyed in an analogous way.

I claim 1. The process of 'dyein'g textile fiber which consists in reacting on dibenzoyl-l.S-diaminoanthraquinone with suitable reducing agents to form leuco compoundswhich are then applied to the fiber and finally oxidized, thus producing on the fiber a yellow shade of ex treme fastness.

p 2. The process of'dyeingtextile fiber which consists in reacting on dibenzoyl-1.8-dia1ninoanthraquinone with alkaline reducing agents to form leuco compounds which are then applied to the fiber and finally oxidized, thus producing on the fiber a yellow shade of extreme fastn'ess.

3. The'process of dyeing textile fiber which consists in reacting on dibenzoyl-LS-diaminoanthraquinone with hydrosulfite and causticsoda lye to form leuco compounds which are then applied to the fiber and finally oxidized,

.thus producing on the fiber a yellow shade of extreme fastness.

4. As a new article of manufacture, yellow colored textile fiber impregnated with the oxidation products of the leuco compound of dibenzoyl 1.8 diaminoanthraquinone which treated fiber remains unchanged upon boiling with 10% muriatic acid, and remains also unchanged upon being touched with cold dilute and cold concentrated nitric acid and which upon being touched with a watery solution containing 0.4% of anhydrous h drosulfite of sodium and 0.8% of caustic soc a changes its color of yellow to rust brown which on exposure to air assumes again its original appearance.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

C. J. WRIerIT'. 

